系统随机抽样的推荐样本大小是500名儿童。
The recommended sample size for a systematic random sampling is 500 children.
要进行一次系统随机抽样，必需知道人群中的家庭总数，平均每户家庭5岁以下儿童的个数，以及总人口。
To undertake a systematic random sampling, one needs to know the total number of households, the average number of children under 5 years of age in a household, and the total population.
方法：用分层随机抽样法确定调查点。 用尼龙袋集卵孵化法、顶管孵化法分别对人畜进行查病，用系统抽样结合环境抽样法开展螺情调查。
Methods: Using stratified sampling method to determine the survey places, The schistosomiasis in people and livestock were surveyed by the methods of nylon bag incubation and top - tube incubation.
群样本检验中，系统抽样群样本检验和分层随机抽样群样本检验的效果优于简单随机抽样群样本检验。
During the course of cluster sample verification, systematic sampling and stratified sampling "s accuracy are prior to simple random sampling" s.
方法采用随机抽样调查，依据《公共场所集中空调系统卫生规范》对空调系统的通风量、管道积尘等指标进行采样检测。
Methods Air samples were collected by randomized sampling, and detected the hygiene indexes based on Specification for hygiene Management Central Air Conditioning Ventilation System of Public Place.
方法采用随机抽样调查，依据《公共场所集中空调系统卫生规范》对空调系统的通风量、管道积尘等指标进行采样检测。
Methods Air samples were collected by randomized sampling, and detected the hygiene indexes based on Specification for hygiene Management Central Air Conditioning Ventilation System of Public Place.
应用推荐